If it draws like 9watts in handheld mode, and going from 20nm planear to 16nm FinFETs..... you might see a reduction to like half.
If they can get it down to 4-5watts in handheld mode, that should be possible to cool passively, without it being reckless.
But if these mini's cant dock, then its not a issue, or maybe they need a special dock to help with cooling or such.
Removing the fan would save a lot of room for better things. It would be great if they had no internal fan, but had vents to allow cooling via a fan on the docking station like you are suggesting.
All I want from a Switch Mini, is something about the Size of the Vita, so that I can start playing my Switch collection on the go. The current device is too big for daily on the go use, and the Vita is loosing support and functionality rapidly. I just canceled the 3G for Vita, because it has become close to useless for any connected functions. Ultimately it would be incredible if Nintendo offered a 4G LTE model, but that would be beyond a miracle at this point.
Everything being shown looks great, now I just want to see what it becomes.
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